Light yellow powder or yellow crystalline powder; odorless, almost tasteless.
Vasodilator. This product is a calcium channel blocker (slow channel blocker or calcium ion antagonist), can inhibit the cardiac and vascular smooth muscle transmembrane calcium influx without altering serum calcium concentrations. This product has a high degree of vascular selectivity for vascular smooth muscle calcium antagonism is stronger than the effect on the heart muscle. For ischemic cerebrovascular disease and patients with essential hypertension.